dead battery - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 14 (permalink) Old 10-16-2015, 02:37 PM Thread Starter
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dead battery

so this has happened to me to few times lately. Basically i go to start the bike after its been sitting for a couple of weeks and the battery is dead. I checked all the normal things, like did i not turn the key all the way off and left the lights on or anything like that. once i charge the battery and reinstall it everything starts right up. i always check to see if anything came on or if i heard a noise or anything when i first connect the battery, hoping to find what has been draining it, but no luck. finally this morning when i was reinstalling the battery i heard the fan kick on. it ran the whole time i was putting the seat back on. i wasnt in a hurry so it was a few minutes. i drove around the block and parked the bike again. the fan ran for a second and then cut off, like it should.

has anyone experienced this? is the fan even connected to this issue? what else could be draining the battery? it is a new battery bought this July and the bike is completely stock.

thanks for the help!

Drew
'03 VN750 a little over 4300 miles
Spline lube
F&S Rear blinker relocation
F&S Luggage rack
Saddlebags
F&S Extended backrest
Mustang seat
F&S Engine guard
Plexifairing 3 windshield
KM style dash
LED everything + additional brake lights &
LED plate bolts



Last edited by Drew M.; 10-16-2015 at 02:39 PM.
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post #2 of 14 (permalink) Old 10-16-2015, 04:54 PM
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Are you sure your bike is charging the battery when you're running it? Check voltage @ the battery with the bike running. You want to see near 14v @ 5000rpms.

Otherwise you could simply have a bad battery.

(didn't see the fan was on when cold? it's ok for it to come on after you turn the bike off when hot but shouldn't run when cold)

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350

Last edited by thtanner; 10-16-2015 at 05:57 PM.
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post #3 of 14 (permalink) Old 10-16-2015, 05:11 PM
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Quote:
finally this morning when i was reinstalling the battery i heard the fan kick on. it ran the whole time i was putting the seat back on. i wasnt in a hurry so it was a few minutes.
Probably a bad fan switch and the fan is kicking on when you're not around. It shouldn't have been running if the bike was cold.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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post #4 of 14 (permalink) Old 10-16-2015, 05:13 PM
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Quote:
Originally Posted by Spockster View Post
Probably a bad fan switch and the fan is kicking on when you're not around. It shouldn't have been running if the bike was cold.
or a possible short in the wiring harness that leads to the switch. most common location is under the neck covers

2005 VN750

Sold 11-27-17
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post #5 of 14 (permalink) Old 10-16-2015, 05:20 PM
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Originally Posted by michiganteddybear View Post
or a possible short in the wiring harness that leads to the switch. most common location is under the neck covers
True, the fan switch works by grounding, so if that single wire grounds anywhere, the fan should kick on.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
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Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #6 of 14 (permalink) Old 10-16-2015, 07:44 PM Thread Starter
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cool. thanks for the tips. i know what i am doing this weekend! i will keep you updated.

Drew
'03 VN750 a little over 4300 miles
Spline lube
F&S Rear blinker relocation
F&S Luggage rack
Saddlebags
F&S Extended backrest
Mustang seat
F&S Engine guard
Plexifairing 3 windshield
KM style dash
LED everything + additional brake lights &
LED plate bolts


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post #7 of 14 (permalink) Old 10-17-2015, 05:58 PM Thread Starter
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well, im not sure if this is part of the problem, but when i started to track down the wires, i started at the fan and the fan switch on the radiator. as soon as i touched the connection between the hot wire and the fan switch it broke right off. it was rusted completely through. so even if that wasnt the problem, and there is still a ground some where the fan will not be draining the battery. on the down side, the fan will not turn on now. i looked up the part and it is $100.00+.

Drew
'03 VN750 a little over 4300 miles
Spline lube
F&S Rear blinker relocation
F&S Luggage rack
Saddlebags
F&S Extended backrest
Mustang seat
F&S Engine guard
Plexifairing 3 windshield
KM style dash
LED everything + additional brake lights &
LED plate bolts



Last edited by Drew M.; 10-17-2015 at 06:33 PM.
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post #8 of 14 (permalink) Old 10-17-2015, 06:47 PM
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you can find used radiator assy on ebay for much less, and some even include the fan and shroud

2005 VN750

Sold 11-27-17
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post #9 of 14 (permalink) Old 10-17-2015, 08:02 PM
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Quote:
Originally Posted by michiganteddybear View Post
you can find used radiator assy on ebay for much less, and some even include the fan and shroud
Yes, I posted one yesterday, $36 for radiator, fan, switches and all. shipped. Posted in a thread about overheating. The person in that thread had a fan switch kicking on at the wrong time also.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
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post #10 of 14 (permalink) Old 10-18-2015, 01:57 PM Thread Starter
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went to start the bike this morning and it was dead again. so either the fan is still draining the battery even though the fan switch is completely disconnected or something else is draining the battery. on an up note, i did find radiator on ebay for $20. so thanks for that info!

Drew
'03 VN750 a little over 4300 miles
Spline lube
F&S Rear blinker relocation
F&S Luggage rack
Saddlebags
F&S Extended backrest
Mustang seat
F&S Engine guard
Plexifairing 3 windshield
KM style dash
LED everything + additional brake lights &
LED plate bolts


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